Forging bearing straight three-way production method

A manufacturing method and forging technology, which is applied in the field of large-scale straight three-way manufacturing, can solve problems affecting product quality, high material consumption, and great difficulties, and achieve the effects of saving manpower and time, eliminating loose materials, and reducing the processing period

Inactive Publication Date: 2008-08-27
SHANGHAI DINGFU MACHINERY MFG
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Problems solved by technology

[0002] Large straight tees are mainly used for tee joints such as large boiler pressure vessel pipes. They are resistant to high pressure (≥30MPa) and high temperature (≥500°C). As forgings, they belong to the highest level (level 5) hammer free forgings. They are large in size and shape. Complicated, the state required for the stamping of the main hole is technically quite complicated
The use requirements include "normal", "abnormal", "emergency" and "accident" to determine the consequences and hazards of different working co

Method used

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  • Forging bearing straight three-way production method
  • Forging bearing straight three-way production method
  • Forging bearing straight three-way production method

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Embodiment Construction

[0016] The following describes the features of the present invention and other related features in further detail through embodiments in conjunction with the accompanying drawings, so as to facilitate the understanding of those skilled in the industry:

[0017] Such as Figure 1-3 As shown, the numbers 1-5 respectively indicate: blank 1, branch hole 2, interview piece 3, end test piece 4, and main hole 5.

[0018] The method of this embodiment includes the following steps:

[0019] (1) Blank preparation: cut off the head and tail of a qualified steel ingot, and forge it into a forging blank 1 that meets the requirements. Determine the center point of the main punching hole according to the actual shape and size of the required straight tee.

[0020] (2) Forming treatment of straight three-way main holes and supporting holes: forging punching, offset reaming and die positioning are performed at the center point of the main hole punching of the blank 1 Forging and punching are carrie...

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Abstract

The invention relates to a pipeline for pressure vessels, in particular to a method for manufacturing high-pressure and high-temperature resistance large straight-tees. The method comprises the following steps: preparing the blank to be forged; then carrying out the molding treatment of the straight-tee main and branch holes, wherein the molding treatment is carried out by forging punching holes and enlarging holes, and when forging the punching holes, the position of the center line of the main hole forged deviates from the position of the center line of the blank; and finally, carrying out after-forging treatment, including the re-treatment of the main hole and the branch hole. The method has the advantages of replacing the status of the imports all year round, reducing the cost of production, greatly saving the manpower and time, and decreasing the processing period. Furthermore, the method uses the forged punching, thereby eliminating the defect that the material inside the solid core of the large billet is loose, and significantly improving the mechanical performance of the product when tested by the United States ASME SA182 standard.

Description

Technical field [0001] The invention relates to pressure vessel pipes, in particular to a method for manufacturing a large-scale straight three-way that is resistant to high pressure and high temperature. Background technique [0002] Large straight tees are mainly used for tees such as large boilers and pressure vessel pipes. They are resistant to high pressure (≥30MPa) and high temperature (≥500℃). As forgings, they are the highest grade (grade 5) free forgings on the hammer, with large volume and shape. Complex, the required state of the main hole for punching and forming is technically quite complicated. The use requirements include "normal", "abnormal", "emergency" and "accident" and other different operating conditions of the consequences and the degree of harm to determine its inspection standards, the production of such forging products is quite difficult. [0003] At present, the product is mainly dependent on imports. The large straight tee imported from abroad is forge...

Claims

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Application Information

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IPC IPC(8): B23P15/00B21J5/10B21D39/08
Inventor 王兴中王元华
Owner SHANGHAI DINGFU MACHINERY MFG
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